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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Stock-Based Compensation [Abstract] |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] |
| 2018 | 2017
Weighted average fair value per option | $ | 1.70 | $ | 2.37
Expected term (1) |  | 6 years |  | 5 years
Risk-free interest rate (2) |  | 2.13 | % |  | 1.22 | %
Expected dividend yield (3) |  | 5.69 | % |  | 4.60 | %
Expected volatility (4) |  | 13.71 | % |  | 14.41 | %
(1) The expected term of the option awards is calculated based on historical exercise behaviour and represents the period of time that the options are expected to be outstanding.
(2) Based on the Bank of Canada five-year government bond yields.
(3) Incorporates current dividend rates and historical dividend increase patterns.
(4) Estimated using the five-year historical volatility.
Schedule of Stock Options Roll Forward [Table Text Block] |
| Total Options |  | Non-Vested Options(1)
| Number of Options | Weighted average exercise price per share |  | Number of Options | Weighted average grant date fair-value
Outstanding as at December 31, 2017 | 3,643,575 | $ | 39.42 |  | 1,739,650 | $ | 2.52
Granted | 627,600 |  | 39.93 |  | 627,600 |  | 1.70
Exercised | (23,800) |  | 24.98 |  | N/A |  | N/A
Vested | N/A |  | N/A |  | (666,125) |  | 2.51
Forfeited | (11,700) |  | 45.10 |  | (11,700) |  | 2.54
Expired | (10,100) |  | 39.93 |  | (10,100) |  | 1.70
Options outstanding December 31, 2018 | 4,225,575 | $ | 39.56 |  | 1,679,325 | $ | 2.22
Options exercisable December 31, 2018 (2)(3) | 2,546,250 | $ | 37.15 |  |  |  |
(1) As at December 31, 2018, there was $5 million of unrecognized compensation related to stock options not yet vested which is expected to be recognized over a weighted average period of approximately 2.2 years (2017 - $3 million, 2.5 years).
(2) As at December 31, 2018, the weighted average remaining term of vested options was 5.1 years with an aggregate intrinsic value of $18 million (2017 - 5.4 years, $22 million).
(3) As at December 31, 2018, the fair value of options that vested in the year was $2 million (2017 - $2 million).
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] |
| Employee DSU |  | Weighted Average Grant Date Fair Value | Director DSU |  | Weighted Average Grant Date Fair Value
Outstanding as at December 31, 2017 | 751,600 | $ | 28.44 | 472,485 | $ | 35.33
Granted including DRIP | 90,549 |  | 38.72 | 101,676 |  | 43.93
Exercised | (5,040) |  | 30.15 | (10,640) |  | 25.31
Outstanding and exercisable as at December 31, 2018 | 837,109 | $ | 29.54 | 563,521 | $ | 37.07
| Employee PSU |  | Weighted Average Grant Date Fair Value |  | Aggregate intrinsic value
Outstanding as at December 31, 2017 | 829,998 | $ | 43.41 | $ | 41.1
Granted including DRIP | 486,181 |  | 47.84 |  |
Exercised | (176,805) |  | 38.85 |  |
Forfeited | (12,260) |  | 44.88 |  |
Outstanding as at December 31, 2018 | 1,127,114 | $ | 46.02 | $ | 56.9

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